I am 24 and got Shingles out of the blue, so I was being tested for immunodeficiency. My streptococcous pneumoniae titers were low, so my doctor gave me the vaccine and orders to have my blood drawn in 4 weeks to recheck. I completely forgot to have my blood drawn and it is now 7 weeks later. Is it too late to have my blood drawn now? Will it even show anything?