I had the same thing happen. On 250mg of test c a week. Doing twice a week injections. My rythm labs had been showing over 1500 on my total test the previous two draws. Latest one I did an extra day after my injection. Injected Thurs, did draw Monday morning, and my total T was only 1000. My SHBG is single digits. Needless to say I increased my injection schedule to 3x a week.

Batch numbers have been shown to to pretty irrelevant across the board. With some variation in the vials everything looks normal. Do you know your SHBG. That will give you an idea of how fast you chew through Test. Those of us with single digit SHBG can usually assume we are metabolizing Test C in 4-5 days instead of the 6-7.

But, you really should pin more often at those levels. You're inviting more swings.

You could look this up, brother. Cypionate has been studied to death. Serum levels generally peak around 72 hours after an IM injection, give or take depending on the individual. Your first lab was drawn right around that window. The second was another full day later, after levels had already started coming down.

That’s why I don’t think this is a meaningful comparison. You’re looking at two different points on the curve, not two equivalent troughs. The fact that both total and free testosterone fell by a similar proportion actually makes the results look pretty consistent to me.

If you’re trying to judge the gear, I’d repeat the labs at the exact same point in the injection schedule. Otherwise, I’d be hesitant to draw any conclusions from these numbers alone.