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the difference between beta hcg test and serum hcg test?

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I did beta hcg test which was negative after got spot of blood instead of my period.Then after one week another doctor said me to do serum hcg test,so both are differ?What is the difference between Beta Hcg and Serum Hcg test?Please reply me

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replied March 13th, 2012
Am I Pregnant Answer A32721
Welcome to ehealthforum,
Both the tests are quantitative tests that measure the HCG levels in your blood/serum. Beta HCG or the pregnancy hormone is produced by the cells of the implanting egg and can be produced in the absence of an embryo. Beta HCG can be detected in maternal plasma or urine by 8 to 9 days after ovulation, but picked up by a blood test about 11 days after conception, and about 12 - 14 days after conception by a urine test. Usually the HCG levels will double every 72 hours if the pregnancy is going on smoothly. The level will reach its peak in the first 8 - 11 weeks of pregnancy and then will decline and level off for the remainder of the pregnancy. HCG levels reach a peak level at about 8 to 10 weeks and then decline for the remainder of the pregnancy. Be in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately.
Take care.

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