Table 4.

Production of LH and regular hCG during non-gestational menstrual cycles [166].

Number of valid non-gestational menstrual cycles	371 cycles
Timing of LH peak concentration during valid menstrual cycles mean ± SD)	14.6 ± 3.1 days
Number of urines tests	11,122
Length of menstrual cycle, start of bleeding to next start of bleeding	28.6 ± 3.8 days
Of valid cycles, the mean peak LH concentration ± SD	210 ± 161 mIU/ml
Number of positive daily hCG tests, 1 IU/L sensitivity, in valid menstrual cycles	371
Proportion of menstrual cycles with positive regular hCG test, 1 IU/L sensitivity	332 (89%) cycles
Cycles with positive regular hCG test, regular hCG mean ± SD	1.52 ± 0.91 mIU/ml
Cycles with positive hCG test, hCG range	1.0 – 9.3 mIU/ml

hCG assay used is the Siemens Immulite hCG test with < 0.1% crossreactivity with LH. Standard deviation is abbreviated as SD.