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A member asked:

My complement total (ch50) was elevated in july. four months later, it was low (33). what can cause this?

A doctor has provided 1 answer

It fluctuates: These levels vary tremendously with minor illness, even little viral stuff that you don't know you have. And reference ranges are set so that a few percent of healthies fall outside on either end. These labs are only small pieces in diagnostic puzzles.

Answered 12/17/2016

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Related Questions

A member asked:

Can you have a normal ch50 (total complement) blood test result, but still have low C3 and/or C4 levels?...Or would low C3 or C4 show up on ch50 test?

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A member asked:

Could my severe vitamin d deficiency be the cause of my extremely high complement ch50 level? C3 and C4 are normal.

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A member asked:

I had a complement total 50 done with c3-c4 but dr only did total ch50 and it is 60 , i also have autoimmune diseases hashimotos ,sle,ra,mctd and my crp is very very low 5 is this of concern as my dr is not sure , just said it is your autoimm?

3 doctors weighed in across 2 answers

A member asked:

My 14yo has C3 level is 71, C4 is 13, C50 is 60. Alkaline phosphatase plasma low 72. Because total complement was ok, we were told she is fine?? Family history of Lupus. She has face rash, cold hands turning purple, low energy. Should I worry?

2 doctors weighed in across 2 answers

A member asked:

What are the acceptable range for "Complement Activity, Total (CH50)" for a 3 years old Kid? Why is my kid result showing "greater than 60" instead of definite value. Does it mean it is anywhere between 60 and 70?

A doctor has provided 1 answer

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