worried daughter

different labs make a difference Retest with the most recent lab in 2-3 months should give you a better picture Good luck

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< or = to 0.1ng/ml has no significance. There is a diurnal rhythm to PSA. And it can be affected by activity.
Some labs recommend a 7-9 hour fast. He is a long, long way from 3.0ng/ml. And there is no need to worry until >3.99ng/ml. Prostate Specific Antigen ( a misnomer) isn't specific to the prostate. Even salivary glands produce a little.
Still, don't stop worrying; it's such a lovely thing in a daughter. You must have a good dad.
Bless you both.

He’s the best dad ever and I hope to have many more years with him 😢

Different labs can give different results. My PSA was usually less than 0.05 at MSKCC. At an annual physical for my fire department it came back greater than 1.0. An immediate retest at MSKCC came back less than 0.05.
Different lab different result.

Your Dad is a lucky man to have a daughter like yourself. Since your Dad had his prostate removed his PSA should be < 0.1. It sounds like your Dad had been getting the Ultra sensitive PSA tests at the prior lab. He needs to verify if the new lab processed as an Ultra sensitive test or standard test. The low limit on a standard PSA test is 0.1. Most labs only run the standard test so it's definitely possible that your Dad's last blood test went to a standard lab from the new PCP. Also, the less than sign, < , is important. The lab results hopefully read < 0.1. If that's the case your Dad is fine. I would contact the PCP and definitively find out what type of PSA test was performed. Frankly, the new PCP should have asked your Dad if he wanted to have the ultra sensitive test or the standard test. If your Dad's test result was actually 0.1 on the nose (in either the ultra or standard test) I would request the PSA be ran again in a month or two not six. Even if his test is actually 0.1 most likely a follow up PSMA test will show nothing and radiation to the prostate bed and surrounding area will be recommended. I think his blood test went to a lab that only runs the standard test. In any case he'll be fine.

I had mine removed at 68 in 2020. I know the labs report it differently so I always use the same lab. my results show < 0.01. so they must be using a different test. I know my daughter would worry but it is what it is. His has barely moved if at all. If the cancer comes back after 6 years then it should be easy to keep under control. If think on this site someone left a quote. "Mark Twain once said that I know worrying must help because it never comes true. "

Thank you for your comment it made me feel better

I think this is what happened as well. It was a regular PSA test. Thank you very much this made me feel better

Thank you very much for the detailed response. I looked in my chart and I believe it was a regular PSA that went to the clinic lab. And it wasn’t a sensitive test.