Hi Lunacat13 -
Welcome to the forum! I'm sorry you're here but your dad is lucky that you found us.
The funny thing is - the "weak" positive result really has nothing to do with the the Lyme infection, how bad it is or the diagnosis of Lyme disease. The ONLY thing this test is measuring is how well your immune system is responding to the presence of the Lyme microbe. It's a serology test so it's looking for antibodies created by a healthy immune system to the Lyme microbe, not the Lyme microbe itself.
And often Lyme can break down the immune system so it's not functioning like it would in a healthy person, a person can have a lower-functioning immune system because of other illnesses or challenges to the immune system, poor GI health (70% of our immune system is in our GI), and the older you are, the lower the immune system functions. Therefore, it is not at all uncommon for people to have trouble developing enough antibodies for the test to pick up.
Because of the unreliable immune response and a few other reasons that make these tests only about
50% accurate (according to studies), the CDC recommends that MDs use a clinical diagnosis approach to diagnose Lyme:"Surveillance case definitions establish uniform criteria for disease reporting and should not be used as the sole criteria for establishing clinical diagnoses, determining the standard of care necessary for a particular patient, setting guidelines for quality assurance, or providing standards for reimbursement." www.cdc.gov/lyme/stats/survfaq.html
I agree with Girlie - most MDs won't know how to diagnose Lyme clinically so that's why it's really important that he get your dad to a specialist.
Here is a symptom list to help your dad and the specialist get prepared for the initial appointment - can help determine if he might also have any coinfections, which are very common with Lyme and can help the specialist with a clinical diagnosis, which requires consideration of health status and symptoms:
Jernigan's symptom list:www.healingwell.com/community/default.aspx?f=30&m=3673749&g=3673789#m3673789
Hope this is helpful - if not just keep asking questions -
LYME FORUM MODERATOR
Chronic late-stage lyme—likely infected in '98; Clinically dx Mar'14 w/ Babs, Fry Labs+ Bart-like, CDC+ Bb. First treated 4-5 viruses, GI/immune. Herbal antimicrobials in May; IV port-started Rocephin in Nov; added vancomycin Mar'16;
DETOX: Pinella/Burbur/Parsley/Milk thistle/Burdock/Red root; Samento/Banderol/Enula; JK/Turmeric; BFM-1; antifung; many supps; cholestyramine