I had a urine test at the Dr. Office last week, I thought I may have had a kidney infection because of back pain. Although the back pain was a little different than kidney pain I'd had before. It didn't show anything but they cultured it. They also drew blood. The blood came back fine, but the culture (they called today) showed Lactobacillus.
My patient page online showed this..."Greater than 100,000 CFU/mL of Lactobacillus species May represent colonizers from external and internal genitalia."
I'm pretty confused by this. (since I've always thought this was a GOOD bacteria) I'm reading on it, but wanted to ask, is there any specific reason why the ketogenic diet would cause higher levels of lactobacillus?
They called me in a prescription for antibiotic, and I'm just not sure if I should even take it.
They kind of acted like "well I guess we'll just go ahead and give you antibiotic even though we're not sure you need it". I hate to take it if I don't need it.

On a side note, my ketones were 50 (5)!

And this is one reason why we are facing superbugs, and ineffective antibiotics now. If you need them, fine. But avoid them if you can.
As to your specific question, I'm sorry, I have no knowledge of that.

I've never heard of a kidney infection where you don't also have the symptoms of a bladder infection, which is pretty miserable. When you have it, you know it. I'd guess the lactobacillus is contamination of the sample from the "surrounding area." Lactobacillus is found in and on a lot of parts of your body.

I think that this means that the sample of urine may be contaminated from the private areas.

I've had to retest before because of contamination.

You should ask for a hat...it sits in the toilet seat and catches the urine. Then you get up, dressed and pour the urine from the hat into the lab container.

That way you are sure you are not touching your private parts with the lab container while getting the sample, possibly adding bacteria from outside the body to the container.