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peculiar_lady2 -> RE: I think i'm pregnant.. (4/28/2008 6:20:29 PM)
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quote:
Is it possible that I still might be pregnant, even if the test I take in the morning comes back negative? Could I still be taking the test too soon for it to pick it up? yes and yes. Basically tests generally test for hCG (the human growth hormone) in your urine. It starts out slow and generally doubles every day...in your blood (which is why a blood test is more accurate earlier on)...then when it gets to a certain level it can start to spill over into the urine. So until it gets to the level that it spills over then you can still test negative for a urine test. The general levels of hCG according to THIS SITE are (btw, LMP is last menstrual period)..... Guideline to hCG levels during pregnancy: hCG levels in weeks from LMP (gestational age)* : * 3 weeks LMP: 5 - 50 mIU/ml * 4 weeks LMP: 5 - 426 mIU/ml * 5 weeks LMP: 18 - 7,340 mIU/ml * 6 weeks LMP: 1,080 - 56,500 mIU/ml * 7 - 8 weeks LMP: 7, 650 - 229,000 mIU/ml * 9 - 12 weeks LMP: 25,700 - 288,000 mIU/ml * 13 - 16 weeks LMP: 13,300 - 254,000 mIU/ml * 17 - 24 weeks LMP: 4,060 - 165,400 mIU/ml * 25 - 40 weeks LMP: 3,640 - 117,000 mIU/ml * Non-pregnant females: <5.0 mIU/ml * Postmenopausal females: <9.5 mIU/ml * These numbers are just a GUIDELINE-- every woman’s level of hCG can rise differently. It is not necessarily the level that matters but rather the change in the level. so as you can see the "normal" range is a very very wide range and can be vastly different for every woman. That's why most tests say to wait longer or to use more concentrated urine (first morning).....however, if your levels are on the lower end then it simply could be that not enough has built up yet in your blood to spill over into your urine.
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