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ABG Interpretation - Patient: ABDHUL LATHEEF
Arterial Sample | 21 July 2026, 19:10
Step 1 - Raw Values at a Glance
| Parameter | Value | Reference | Status |
|---|---|---|---|
| pH | 7.33 | 7.35-7.45 | Low - Acidemia |
| pCO2 | 28.1 mmHg | 35-45 | Low |
| pO2 | 63 mmHg | 83-108 | Low - Hypoxemia |
| HCO3 | 14.5 mmol/L | 22-26 | Low |
| Base Excess | -10.0 mmol/L | -2 to +2 | Markedly negative |
| Hematocrit | 25% | 36-55 | Low - Anemia |
| Hb | 7.9 g/dL | ~12-17 | Low |
| Na+ | 137 | 135-145 | Normal |
| K+ | 4.32 | 3.5-4.5 | Normal |
| Cl- | 100 | 95-106 | Normal |
| iCa2+ | 0.97 mmol/L | 1.15-1.29 | Low - Hypocalcemia |
Step 2 - Primary Disorder
- pH 7.33 = Acidemia
- HCO3 14.5 = Low bicarbonate - this is a Metabolic Acidosis
- Primary disorder: Metabolic Acidosis
Step 3 - Anion Gap Calculation
The report provides two AG values:
- Anion Gap (with K+): 26.3 mmol/L (= Na + K - Cl - HCO3 = 137 + 4.32 - 100 - 14.5 = 26.8, consistent)
- Anion Gap (without K+): 22.0 mmol/L (= Na - Cl - HCO3 = 137 - 100 - 14.5 = 22.5, consistent)
Both are markedly elevated (normal AG without K+ is <12-14 mmol/L).
This is a HIGH ANION GAP METABOLIC ACIDOSIS (HAGMA).
Using the MUDPILES mnemonic for causes (Rosen's Emergency Medicine):
M - Methanol | U - Uremia | D - DKA/AKA | P - Paraldehyde/Propylene glycol | I - Iron/Isoniazid | L - Lactic acidosis | E - Ethylene glycol | S - Salicylates
Lactic acidosis is the single most common cause (~50% of HAGMA cases). DKA, uremia, and toxic ingestions must also be considered.
Step 4 - Respiratory Compensation Assessment (Rule of 15 / Winters' Formula)
Expected pCO2 using Winter's formula:
Expected pCO2 = (1.5 × HCO3) + 8 ± 2 = (1.5 × 14.5) + 8 = 21.75 + 8 = 29.75 ± 2 (range: ~27.8-31.8 mmHg)
Measured pCO2 = 28.1 mmHg - this falls within the predicted range.
Rule of 15 cross-check: HCO3 + 15 = 14.5 + 15 = 29.5 - measured pCO2 is 28.1, very close.
Conclusion: Respiratory compensation is APPROPRIATE - this is a simple HAGMA with adequate compensatory hyperventilation (Kussmaul breathing). There is no additional primary respiratory disorder.
Step 5 - Delta-Delta Ratio (Mixed Disorder Check)
Delta AG / Delta HCO3 = (AG - 12) / (24 - HCO3) = (22 - 12) / (24 - 14.5) = 10 / 9.5 = ~1.05
- Ratio 1-2: Pure HAGMA (no hidden metabolic alkalosis or normal AG acidosis)
- This result confirms a single, uncomplicated HAGMA.
Step 6 - Oxygenation
- pO2 63 mmHg = Moderate hypoxemia (normal >83 mmHg)
- SO2 90.7% = Borderline (target usually >94%)
- Hb 7.9 g/dL = Significant anemia - oxygen-carrying capacity is severely reduced
- The combination of hypoxemia + severe anemia means oxygen delivery (DO2) is critically compromised
Step 7 - Ionized Calcium
- iCa2+ 0.97 mmol/L (normal 1.15-1.29) = Hypocalcemia
- At corrected pH 7.40: cCa2+ 0.94 (even lower when alkalosis is corrected)
- Possible causes: hypoalbuminemia, pancreatitis, citrate toxicity (if transfused), sepsis
Summary Interpretation
| Finding | Conclusion |
|---|---|
| Primary disorder | High Anion Gap Metabolic Acidosis |
| Compensation | Appropriate respiratory compensation (hyperventilation) |
| Mixed disorder? | No - delta-delta ratio 1.05 = pure HAGMA |
| Oxygenation | Moderate hypoxemia (pO2 63) + severe anemia (Hb 7.9) = critically low O2 delivery |
| Electrolytes | Ionized hypocalcemia |
Clinical Priorities
- Identify and treat the underlying cause of HAGMA - check lactate, blood glucose/ketones, renal function, and toxin screen
- Address anemia - Hb 7.9 g/dL with hypoxemia is an indication for blood transfusion in most critically ill patients
- Correct hypoxia - supplement O2, assess for respiratory failure
- Monitor ionized calcium - correct if symptomatic (tetany, arrhythmia)
- Serial ABGs to assess response to treatment
Source: Rosen's Emergency Medicine - Metabolic Acidosis section; MUDPILES classification and Rule of 15 methodology.
Urine osmolality 299 Urine sodium 6 Interpret
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Here is the full interpretation integrated with the previous ABG findings:
Urine Studies Interpretation
| Parameter | Value | Significance |
|---|---|---|
| Urine Osmolality | 299 mOsm/kg | Isotonic (= plasma) |
| Urine Sodium | 6 mEq/L | Extremely low (<10) |
Urine Sodium 6 mEq/L - What it means
A urine sodium <10 mEq/L is a hallmark of pre-renal physiology - the kidneys are maximally retaining sodium in response to perceived volume depletion or low effective circulating volume. This occurs via:
- Activation of the renin-angiotensin-aldosterone system (RAAS)
- Renal sympathetic activation
- Suppression of ANP
Urine Na <10 is strongly consistent with prerenal AKI (Brenner & Rector's The Kidney). Values <20 mEq/L + FENa <1% indicate prerenal azotemia, distinguishing it from ATN (which typically shows UNa >40 and FENa >2%).
Urine Osmolality 299 mOsm/kg - The Paradox
This is the clinically important discordance here:
- Normal concentrated urine in true volume depletion should be >500 mOsm/kg (maximally up to 1200)
- Urine osmolality of 299 is essentially isotonic with plasma - meaning the kidneys are NOT concentrating the urine despite the signal to do so
This isotonic urine + very low UNa pattern points to one of these scenarios:
| Scenario | UNa | UOsm | Explanation |
|---|---|---|---|
| Classic pre-renal | <20 | >500 | Tubules intact, ADH working |
| Hepatorenal / cardiac | <10 | Variable | Sodium avid but concentrating defect |
| Early/transitional ATN | <20 | ~300 | Some Na retention preserved, but concentrating ability lost |
| This patient | 6 | 299 | Sodium maximally retained but concentrating impaired |
The combination of UNa 6 + UOsm 299 is most consistent with:
- Pre-renal state with early ATN transition - tubular Na-reabsorption still intact but concentrating ability is compromised (the most common explanation)
- Hepatorenal Syndrome (HRS) or Cardiorenal syndrome - both cause extreme sodium avidity (UNa often <10) with impaired free water excretion
- Sepsis-associated AKI - can show low FENa (<1%) even in ATN due to preferential cortical ischemia preserving Na transport but impairing concentration
FENa Calculation (if serum creatinine available)
FENa (%) = (UNa × PCr) / (PNa × UCr) × 100
With UNa = 6 and PNa = 137:
- If creatinine data were available, FENa would almost certainly be <1%, strongly confirming pre-renal/HRS pattern
Putting It All Together with the ABG
| Finding | Interpretation |
|---|---|
| HAGMA (AG ~22) | Tissue hypoperfusion → lactic acidosis likely |
| pO2 63 + Hb 7.9 | Critically reduced O2 delivery |
| UNa 6 | Maximal sodium avidity = low effective circulating volume |
| UOsm 299 | Concentrating defect despite sodium retention |
| Ionized hypocalcemia | May indicate sepsis, pancreatitis, or organ failure |
The unified clinical picture is a patient in circulatory shock (likely septic, cardiogenic, or hepatic failure state) with:
- Lactic acidosis from tissue hypoperfusion
- Compensatory maximal sodium retention (UNa 6)
- Impaired urinary concentrating ability suggesting tubular stress/early ATN
- Severe anemia compounding oxygen delivery failure
Immediate priorities:
- Serum lactate, blood cultures, creatinine, LFTs, albumin
- Assess volume status - echo/IVC to guide resuscitation vs. diuresis
- Urine microscopy for casts (muddy brown = ATN)
- Treat underlying cause - sepsis bundle if infectious etiology
Source: Rosen's Emergency Medicine; Brenner and Rector's The Kidney, 2-Volume Set - AKI differential diagnosis section.
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