How to read your parents' lab report from far away

A lab report is designed to be read by a doctor, on the day, next to a patient. It is not designed to be read by a son or daughter on a phone in another time zone, with three other reports from previous years open in other tabs.

This guide isn't about interpreting results. It's about knowing which lines to look at — and noticing when one of them is drifting.

First, the principle: one number tells you little, a series tells you a lot

Every value on a report sits next to a reference range — the band the lab considers typical. A single result inside the band is usually reassuring. A single result just outside it might be nothing.

What the reference range can't tell you is direction. A value that has gone from the bottom of the band to the top over three years is still "in range" on every single report — and is still worth a conversation.

So: for each marker below, the question is not "is it normal?" but "is it moving?"

The markers that appear on almost every report

Kidney: creatinine and eGFR

• Creatinine rises as the kidneys filter less well. Slow, steady increases over years are the thing to watch — especially alongside diabetes or blood-pressure medication.
• eGFR is calculated from creatinine plus age and sex. It moves the other way: lower means less filtration. It's often the more useful number for a trend.

Blood sugar: fasting glucose and HbA1c

• Fasting glucose is a snapshot of one morning.
• HbA1c reflects average blood sugar over roughly three months — a far better trend line. Small upward creeps across several reports matter more than one high fasting value.

Heart and blood vessels: the lipid panel

• LDL cholesterol is the one doctors typically manage most actively.
• Triglycerides swing with diet and can look alarming after a festival week; look at the trend across several fasting reports rather than a single spike.

Blood: haemoglobin

• Low or falling haemoglobin (anaemia) is common in older adults and often has a treatable cause. A gradual decline across reports is worth raising even if each value is only mildly low.

Thyroid: TSH

• Thyroid problems are extremely common in older adults in India and easy to miss because the symptoms are vague — tiredness, weight change, feeling cold. TSH drifting up or down across reports is a cheap, useful thing to flag.

Liver: ALT / SGPT and AST / SGOT

• Mild rises are common and often benign, but a sustained upward trend — especially with new medications — is worth a mention at the next visit.

Three things that make comparing reports hard

1. Different labs use different names. "S. Creatinine", "Creatinine (Serum)", and "CREAT" are the same test. Line them up before comparing.
2. Different labs use different units. Creatinine can be reported in mg/dL or µmol/L; HbA1c in % or mmol/mol. A number that looks like it jumped may just have changed units.
3. Different labs use different reference ranges. A value can be "high" on one report and "normal" on the next without changing at all. Compare the number, not the flag.

What to do with a trend you've noticed

Don't diagnose. Don't Google your way to a conclusion at 2 a.m. Write it down, plainly, and bring it to the next appointment:

"Appa's creatinine has gone from 1.4 to 2.0 over four years across these reports. Is that something we should look at, and does it affect any of his current medicines?"

That one sentence is the difference between a trend that gets managed and one that gets missed.

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This guide is general information, not medical advice. Reference ranges and clinical significance vary by person, lab and context. Always discuss results with a qualified clinician.