See the infographic below for a simple iodine deficiency test you can do on your own
Nat Rev Mol Cell Biol 4(7):566577 van der Zwaag PA, van Rijsingen IA, Asimaki A, Jongbloed JD, van Veldhuisen DJ, Wiesfeld AC, Cox MG, van Lochem LT, de Boer RA, Hofstra RM, Christiaans I, van Spaendonck-Zwarts KY, Lekanne dit Deprez RH, Judge DP, Calkins H, Suurmeijer AJ, Hauer RN, Saffitz JE, Wilde AA, van den Berg MP, van Tintelen JP (2012) Phospholamban R14del mutation in patients diagnosed with dilated cardiomyopathy or arrhythmogenic right ventricular cardiomyopathy: evidence supporting the concept of arrhythmogenic cardiomyopathy
doi:10.1155/2016/9130979 [PubMed]
Jin ZL, Gao WY, Guo F, Liao SJ, Hu MZ, Yu T, et al
This enables multiple withdrawals from a single vial over the course of a research protocol without contamination risk