Complement, C4 (serum)
| Units |
Nonpregnant Adult |
First Trimester |
Second Trimester |
Third Trimester |
|
mg/dL |
16 - 47 |
9 - 45 |
10 - 42 |
17 - 37 |
|
g/L |
0.16 - 0.47 |
0.09 - 0.45 |
0.10 - 0.42 |
0.17 - 0.37 |
Some causes of decreased C4 include systemic lupus
erythematosus, lupus nephritis, hereditary angioneurotic edema, hereditary C4
deficiency ,glomerulonephritis, and infancy.
References:
1. Lockitch G. Handbook of Diagnostic Biochemistry and
Hematology in Normal Pregnancy. Boca Raton:CRC, 1993.
2.
Abbassi-Ghanavati M, Greer LG, Cunningham FG. Pregnancy and laboratory
studies: a reference table for clinicians. Obstet Gynecol. 2009
Dec;114(6):1326-31. PMID:19935037
3.
Wallach, J. Interpretation
of Diagnostic Tests, Eighth ed. Lippincott Williams & Wilkins, 2007
4.Appendix. Published Reference Interval During Pregnancy.In: Gronowski AM ed. Handbook
of Clinical Laboratory Testing During Pregnancy . Totowa , NJ:
Humana Press , 2004:423- 437. |
