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Nursing Field Notes / Renal + Fluid · Diagnostics

Urinalysis 🧪

UA — Urine Analysis · read every line on the strip

NG-269 RENAL + FLUID ADHD-friendly visual edition

A UA is a picture of the kidney taken through the toilet 🚽. Each pad on the strip answers one question: how hydrated? · is there infection? · is there bleeding? · is protein or sugar leaking? Learn the normal band for each line and abnormal jumps off the page.

📄 Simple Nursing original — opens in Drive →

💡 Light = hydratedDark = dehydrated — unless on diuretics, SIADH or DI.
💧 Spec. gravity 1.003–1.0301.003 = liquidy body · 1.030 = dry body.
🧠 Look for the “N”Nitrites → pyelonephritis (kidney infection).
🥩 Protein HIGH= Nephrotic syndrome — Nasty protein loss. Glucose high = diabetes.
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COLLECT IT RIGHT

STEP 1 · A DIRTY SAMPLE IS A WRONG ANSWER

Half of UA test questions are not about the result at all — they are about how you got the specimen.

✅ Clean-catch midstream — the standard specimen

1 CLEAN the area front → back, one wipe per swab, then discard 2 START the stream first few mL go in the toilet — they wash out skin flora 3 CATCH the MIDDLE sterile cup · don't touch the inside 4 LABEL & SEND to lab within 1 hour, or refrigerate sitting urine grows bacteria

Never collect a specimen from the urine drainage bag — that urine is old, warm and not sterile. It will grow bacteria that were never in the client.

🧠 “Clean, Skip, Catch, Ship.” Clean the area · skip the first squirt · catch the middle · ship it to the lab in an hour. First morning void is the most concentrated and the best sample when you get a choice.

⭐ Sterile specimen from a Foley — the exact 4 steps KAPLAN

ACCESS PORT CLAMP below the port drainage bag ❌ never sample from here 1 · CLAMP tubing below the port 2 · WAIT 15–30 minutes to fill 3 · SCRUB the port antiseptic swab 4 · ASPIRATE sterile needleless device INDWELLING CATHETER · sterile specimen ✅ unclamp as soon as you're done
🧠 “Clamp · Chill · Cleanse · Collect.” Four C's in order. Forget the clamp and there is nothing at the port to draw; forget to unclamp and you just gave the client urinary retention.

🕐 24-hour urine collection

  • Discard the first void and write down the time — that's the start.
  • Save every drop for the next 24 hours.
  • At the end time, have the client void one last time and add it in.
  • Keep the container on ice or refrigerated.
  • One missed void = start over. ❌
🧠 “Toss the first, keep the last.” The one you throw away is the urine made before the clock started — it doesn't belong to your 24 hours.

🔬 What a full UA actually reports

  • Physical: color · clarity · odor · specific gravity
  • Chemical (the dipstick): pH · protein · glucose · ketones · blood · nitrites · leukocyte esterase · bilirubin
  • Microscopic: RBCs · WBCs · bacteria · casts · crystals · epithelial cells
🧠 Look · Dip · Scope. Three layers, in that order — and the exam question almost always lives in the dip layer.
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READ THE STRIP

STEP 2 · LOW · NORMAL · HIGH

Every line gets a bar. Find where the client's number lands, and the diagnosis walks up to you.

🎨 COLOR — the fastest hydration read in nursing

💡 LIGHT = HYDRATED · 🏜️ DARKER = DEHYDRATED clear pale straw yellow dark yellow amber brown / tea 💧 OVER-hydrated / dilute 🏜️ DEHYDRATED / concentrated ⚠️ BUT: pale urine does NOT mean hydrated if the client is on DIURETICS, has SIADH, or has DIABETES INSIPIDUS. 🚨 Red / pink / cola-colored = BLOOD. Cloudy + foul = infection. Fruity smell = ketones.
🧠 Think lemonade → iced tea. Lemonade urine = well watered. Iced-tea urine = dry as a bone. Cola-colored is a whole different alarm — that's blood or myoglobin.

⭐ Every UA component on a low–normal–high bar

HIGH YIELD Green band = normal. Anything outside it has a name.

URINALYSIS · LOW ◀ NORMAL ▶ HIGH standard adult reference values — confirm against your facility's lab sheet 💧 SPECIFIC GRAVITY — how thick is the urine? 1.003 LOW · LIQUIDY body 1.005 – 1.030 NORMAL 1.030 HIGH · DRY body LOW → fluid overload, over-hydration, diuretics, DIABETES INSIPIDUS. HIGH → dehydration, SIADH, hemorrhage, contrast dye. ⚗️ pH — acid or alkaline? under 4.6 ACIDIC 4.6 – 8.0 NORMAL over 8.0 ALKALINE ACIDIC → starvation, DKA, high-protein diet. ALKALINE → UTI with urea-splitting bacteria, old sitting specimen. 🥩 PROTEIN — should be NONE NEGATIVE / NONE = NORMAL ✅ TRACE · recheck HIGH = NEPHROTIC SYNDROME 🚨 Protein is too big to pass a healthy glomerulus. HIGH also seen in glomerulonephritis, preeclampsia, and heavy exercise/fever (transient). 🍬 GLUCOSE — should be NONE NEGATIVE = NORMAL ✅ HIGH = DIABETES / hyperglycemia Sugar only spills once blood glucose passes the renal threshold (about 180 mg/dL) — the tubule can't reabsorb any more. 🔥 KETONES — should be NONE NEGATIVE = NORMAL ✅ PRESENT = DKA · starvation · low-carb 🩸 RBC / BLOOD “hematuria” 0 – 2 per hpf / NONE ✅ HIGH → stones · bladder CA · post-op TURP · trauma 🦠 WBC “leukocytes” / leukocyte esterase 0 – 4 per hpf / NEGATIVE ✅ HIGH → INFECTION (UTI) · cloudy, foul urine 🧫 NITRITES NEGATIVE = NORMAL ✅ POSITIVE → kidney infection “pyeloNephritis” 🚨 🧠 LOOK FOR THE “N”: N-itrites → pyelo-N-ephritis. Bacteria turn nitrates into nitrites, so a positive pad means bacteria are living up there.
🧠 “Nothing should be in pee but pee.” Protein, glucose, ketones, blood, nitrites and leukocytes should all read negative. The moment one turns positive, it names its own disease.

🩸 RBC in urine = hematuria — the big three causes

  • 🪨 Kidney stones — the stone scrapes the tract on the way down.
  • 🎗️ Bladder cancer — classic clue is painless hematuria.
  • 🔪 Post-operative TURP — some pink drainage is expected; bright red with clots is not.

Also on the list: trauma, glomerulonephritis, anticoagulants, and a menstruating client (recollect).

🧠 “Stones, Suspicious growth, Surgery.” Three S's that put blood in the bowl (the growth is bladder carcinoma). Painful hematuria = stone. Painless hematuria = cancer until proven otherwise.

🦠 WBC + nitrites = the infection pair

FindingWhat it means
WBC / leukocyte esteraseInflammation or infection — usually a UTI
NitritesGram-negative bacteria present → think pyeloNephritis
Cloudy + foul odorPus and bacteria in the specimen
WBC castsInfection is up in the kidney, not just the bladder
🧠 Bladder burns, kidney BLOWS UP. Cystitis = burning + frequency. Pyelonephritis adds fever, chills, and CVA/flank tenderness — that's the one you escalate.

🔬 Under the microscope — casts tell you WHERE the damage is

microscopic field 🔴 RBC CASTS → GLOMERULONEPHRITIS — the filter itself is bleeding ⚪ WBC CASTS → PYELONEPHRITIS — infection has climbed to the kidney 🟤 MUDDY BROWN GRANULAR CASTS → ACUTE TUBULAR NECROSIS — intrarenal AKI 💠 HYALINE CASTS → often normal — exercise, fever, dehydration
🧠 Casts are molds of the tubule. Whatever was sitting in the tubule got shaped like a tube and washed out — so a cast proves the problem is inside the kidney, not the bladder.

🧫 Urine Culture & Sensitivity — two different answers

big zone = SENSITIVE ✅ small zone = RESISTANT ❌ CULTURE WHICH bacteria is causing the infection? takes 24–72 hours to grow SENSITIVITY WHICH antibiotic will kill that bacteria? tells you if the empiric drug was right Over 10,000 organisms/mL = UTI many texts use 100,000 CFU/mL for a clean catch — know your source

⏱️ Order of operations: Draw the culture BEFORE the first dose of antibiotic. Then start the broad-spectrum drug; narrow it when sensitivities return.

🧠 “Culture = WHO. Sensitivity = WHAT KILLS IT.” Culture the criminal, sentence it with the sensitivity.
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ACT ON IT

STEP 3 · MATCH THE PATTERN

Test questions never give you one value — they give you a panel and dare you to pick the one that matters.

⭐ NCLEX exhibit — read the whole UA, then answer

Client with a history of diabetes. The UA reads:

ComponentResultNormal?
Specific gravity1.030🚩 top of range — concentrated / dry
ProteinNone✅ normal — rules OUT nephrotic syndrome
GlucoseHigh🚩 abnormal — diabetes / hyperglycemia
Red blood cellsNone✅ normal — rules OUT stones & bladder CA
LeukocytesMedium🚩 abnormal — infection

What does the nurse suspect? Dehydration from low fluid intake, plus a possible UTI.

The high specific gravity says dry; the leukocytes say infection; the glucose just confirms the diabetes we already knew about — and sugar in the urine feeds bacteria, which is exactly why diabetics get UTIs.

🧠 “Sweet pee = happy bacteria.” Diabetes + concentrated urine + leukocytes is a UTI setup every single time. The normal lines (protein, RBC) are doing work too — they cross diagnoses OFF.

🧪 Common NCLEX blood panel — which value is the kidney red flag?

FOUR VALUES · WHERE DOES EACH ONE LAND? 1 · BUN 19 mg/dL <10 LOW 10 – 20 NORMAL >20 HIGH 19 ✅ NORMAL 2 · Blood glucose 155 mg/dL <70 LOW 🚨 70 – 100 fasting NORMAL HIGH · hyperglycemia 155 🚩 HIGH (expected in diabetes) 3 · Creatinine 1.9 mg/dL ← the kidney-specific one LOW 0.6 – 1.2 NORMAL OVER 1.3 = BAD KIDNEY 🚨 1.9 🚨 KIDNEY DAMAGE 4 · WBC 14,500 /mm³ <5,000 LOW · neutropenia 5,000 – 10,000 NORMAL >10,000 HIGH · INFECTION 14,500 🚩 INFECTION 🎯 The creatinine of 1.9 is the one that says KIDNEY. The WBC of 14,500 says INFECTION. BUN 19 is normal — do not get baited by a number just because it sits near the edge.
🧠 Creatinine is the kidney's own handwriting. BUN can be raised by dehydration, steroids, a GI bleed or a steak dinner — creatinine only climbs when the filter is broken.

🚨 UA findings you escalate, not chart

  • 🩸 Gross hematuria with clots — especially after TURP or biopsy.
  • 🌡️ Nitrites + fever + flank pain → pyelonephritis, needs antibiotics now.
  • 🥩 New heavy proteinuria + edema → nephrotic syndrome workup.
  • 💧 Urine output under 30 mL/hr → kidneys in distress.
  • 🟤 Cola / tea-colored urine after crush injury or a statin → rhabdomyolysis.
🧠 Color + fever + output. Three things you can assess without a lab — and any two of them together buy a phone call to the provider.

🗣️ Teach the client

  • 💧 Fluids 2–3 L/day unless fluid-restricted for renal or cardiac disease.
  • 🚽 Void every 2–4 hours and always after intercourse.
  • 🧻 Wipe front to back, cotton underwear, no bubble baths or douches.
  • 💊 Finish the entire antibiotic course even after the burning stops.
  • ⚠️ Tell them phenazopyridine turns urine bright orange — it's harmless and it stains clothing.
🧠 “Flush, wipe, finish.” Water flushes bacteria out, wiping keeps them from getting in, and finishing the antibiotic keeps them from coming back stronger.
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QUICK RECALL

SAY IT OUT LOUD
💧 1.003 vs 1.030liquidy body vs dry body
🩸 RBC in urine= stones · bladder cancer · post-op TURP
🦠 WBC = UTI · N = pyeloNephritisnitrites climb to the kidney
🥩 Protein high = Nephrotic🍬 Glucose high = Diabetes
🎯 Cover & check — 6 rapid-fire questions
Q1: Specific gravity is 1.003. Wet or dry?
Wet — a liquidy body. Dilute urine from over-hydration, diuretics or diabetes insipidus. 1.030 is the dry, concentrated end.
Q2: Nitrites are positive. What are you thinking?
Look for the “N” — Nitrites means pyeloNephritis, a kidney infection. Bacteria convert nitrates to nitrites.
Q3: List the exact steps to get a sterile specimen from a Foley.
1) Clamp the drainage tube below the port. 2) Wait 15–30 minutes. 3) Scrub the port with an antiseptic swab. 4) Attach a sterile, needleless access device and aspirate through the port. Then unclamp. Never take it from the drainage bag.
Q4: High protein in the urine — which syndrome?
Nephrotic syndrome — “Nasty protein loss.” Also consider glomerulonephritis and preeclampsia.
Q5: What is the difference between a culture and a sensitivity?
Culture identifies WHICH bacteria is causing the infection. Sensitivity identifies WHICH antibiotic that bacteria is sensitive to, so you know what will kill it. Collect the specimen before the first antibiotic dose.
Q6: BUN 19, glucose 155, creatinine 1.9, WBC 14,500. Which one screams kidney?
Creatinine 1.9 — normal is 0.6–1.2 and over 1.3 means a bad kidney. The WBC of 14,500 signals infection; BUN 19 is still within the normal 10–20.
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STUDY SHEETS

FROM YOUR SAVED SET
Renal diagnostic tests with normal ranges and NCLEX significance, plus a which-patient-first prioritization panel and what can be delegated.
Renal diagnostic tests with normal ranges and NCLEX significance, plus a which-patient-first prioritization panel and what can be delegated. — swipe it sideways if it is cut off, or tap to open it full size.
BUN and creatinine together, plus HbA1c — including the clue that a high BUN with a normal creatinine usually means dehydration, not kidney failure.
BUN and creatinine together, plus HbA1c — including the clue that a high BUN with a normal creatinine usually means dehydration, not kidney failure. — swipe it sideways if it is cut off, or tap to open it full size.

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