William Aird – Acute Rise in Total Protein Without Any Change in Albumin: What’s the Best Explanation?
William Aird, Professor of Medicine at Harvard Medical School, posted on X:
“1/7
I recently posted a poll showing an acute rise in total protein without any change in albumin.
Total protein increased from 7.3 → 8.3 → 8.5 g/dL over just 10 days, while albumin stayed ~4.3 g/dL.
The question was: What’s the best explanation?
The answer chosen by 52.9% (the majority) was polyclonal hypergammaglobulinemia.
Here’s the reasoning.
Key principle:
If total protein rises but albumin stays flat, the increase is almost always in the globulin fraction, especially gamma globulins.
This immediately narrows the differential.
Why the other options don’t fit:
- Hemoconcentration → albumin and total protein rise together
- MGUS → does not develop over days to weeks
- Nephrotic syndrome → albumin falls, total protein often falls
So none explain an acute, isolated rise in total protein.
That leaves polyclonal hypergammaglobulinemia, which may be:
- Endogenous (inflammation, immune activation, autoimmune disease)
- Exogenous (IVIG administration)
Same lab pattern, different source.
In this case, the patient was on immune checkpoint inhibitor therapy and developed acute hepatitis and hemolytic anemia, a classic setup for robust endogenous polyclonal Ig production, explaining the rapid rise and persistence.
Teaching pearl:
Stable albumin = globulin problem.
Acute timing = polyclonal until proven otherwise.”
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