Are the pre‑operative lab abnormalities—mild leukopenia, slight macrocytosis, marginally elevated immature granulocytes, hyperglycemia (glucose 155 mg/dL) and hyperkalemia (potassium 5.3 mmol/L)—concerning for proceeding with surgery in two days?

Your Lab Results Are Reassuring for Surgery

Based on current guidelines and recent evidence, your lab results show only minor abnormalities that should not delay your surgery in 2 days, though your surgical team should be aware of the slightly elevated glucose and potassium levels for perioperative management 1, 2.

Breaking Down Your Results in Plain Language

The Good News (Normal Results)

• Blood counts are excellent: Your red blood cells (hemoglobin 13.3), white blood cells (4.2), and platelets (211) are all in healthy ranges for surgery
• Kidney function is normal: Your creatinine (0.8) and estimated kidney filtration rate (85) are appropriate
• Electrolytes are mostly fine: Sodium, chloride, and calcium are all normal
• No bleeding risk: Your blood clotting cells (platelets) are perfect

The Minor Findings (Not Concerning for Surgery)

Immature Granulocytes (0.5%, slightly high)

• This is barely above normal (0.4% cutoff) and clinically insignificant
• This tiny elevation doesn't indicate infection or any problem that would affect surgery 1

Glucose 155 mg/dL (elevated)

• While elevated, this falls within acceptable preoperative range
• Guidelines suggest targeting glucose 100-180 mg/dL before surgery, and you're within this window 2
• This level does NOT require delaying surgery
• Your surgical team may monitor your glucose more closely during and after the procedure
• If you have diabetes, ensure your surgical team knows about it

Potassium 5.3 mmol/L (slightly elevated)

• This is mildly elevated (normal upper limit is typically 5.0-5.2)
• Recent research shows hyperkalemia can be associated with surgical complications, but your level is only borderline 3
• Important caveat: If your blood was drawn and sat for a while before testing, or if you clenched your fist during the blood draw, this could be "pseudohyperkalemia" (falsely elevated) 4, 5
• Your surgical team should verify this with a repeat test or point-of-care testing if concerned

What This Means for Your Surgery

You can proceed safely with surgery based on these results. Modern guidelines emphasize that preoperative testing should be driven by your medical history and specific risk factors, not just abnormal numbers 1. The key considerations are:

• No evidence of infection: Your white blood cell count is normal
• No anemia: Your hemoglobin is healthy for surgery
• No bleeding disorder: Your platelets are normal
• Adequate kidney function: Your kidneys can handle anesthesia medications

What Your Surgical Team Should Know

Your anesthesiologist and surgeon should be informed about:

1. The mildly elevated glucose (they may check it again before surgery)
2. The borderline potassium (they may want to recheck this)
3. Any medications you take, especially for diabetes, blood pressure, or diuretics 1
4. Whether you have diabetes or take medications that affect potassium (ACE inhibitors, ARBs, diuretics) 6

Common Pitfalls to Avoid

• Don't fast excessively before surgery if you have diabetes, as prolonged fasting can worsen glucose and potassium abnormalities 7
• Take your regular medications as instructed by your surgical team
• Mention all medical conditions, even if you think they're well-controlled 1

The evidence strongly supports that routine preoperative testing often finds minor abnormalities that don't change surgical outcomes 1. Your results show you're in good condition for surgery, with only minor metabolic findings that require awareness but not delay.