| YGABAP | Gabapentin Level | — |
| YGDU | Gadolinium, 24 Hour, Urine | — |
| YGDLM | Gadolinium, Serum | — |
| YGA1PU | Galactose-1-Phosphate Uridyltransferase | — |
| YGAL1PH | Galactose-1-Phosphate, Erythrocytes | — |
| YGALEC3 | Galectin-3 | — |
| YGGT | Gamma GT | Kinetic Colorimetric Method |
| YGHBS | Gamma Hydroxybutyric Acid, Serum | — |
| YGPS | Gammopathy Panel, Serum | — |
| YGM1A | Ganglioside (GM1) Antibodies, IgG and IgM | — |
| YGAES | Ganglioside Antibodies Evaluation, Serum | — |
| YGARLIC | Garlic IgE | — |
| YGAS | Gastrin | — |
| YGCCTM | GC/Chlamydia by RNA | Transcription-Mediated Amplification |
| YGCTRNA | GC/Chlamydia/Trich by RNA | Transcription-Mediated Amplification |
| YVCGV1 | General Viral Culture, Non-Respiratory | — |
| YVCRES | General Viral Culture, Respiratory | — |
| YGENTP | Gentamicin, Peak | — |
| YGENTR | Gentamicin, Random | — |
| YGENTT | Gentamicin, Trough | — |
| YGD0 | Gestational Diabetes Screen | Enzymatic Hexokinase Method |
| YGDC | Gestational Diabetes Screen (2 specimens) | Enzymatic Hexokinase Method |
| YGHBU | GHB, Urine | — |
| YGIPARA | GI Parasite Panel by PCR | — |
| YGIPNR | GI Pathogen Panel PCR | Film Array mutiplexed PCR |
| YGIPPRPS | GI Pathogen Panel PCR, w/reflex | Film Array mutiplexed PCR |
| YGLAM | Giardia Antigen by EIA | Qualitative Enzyme Immunoassay |
| YGIARA | Giardia lamblia Antibodies, IgG, IgM, and IgA | — |
| YGLID | Gliadin, IgG & IgA | — |
| YAGLO | Glomerular Basement Membrane Antibody, IgG | Semi-Quantitative Multiplex Bead Assay |
| YGGON | Glucagon | — |
| YGLUC | Glucose | Enzymatic Hexokinase Method |
| YGT2G | Glucose Tolerance 2 Hrs (Gestational) | Enzymatic Hexokinase Method |
| YGT2 | Glucose Tolerance 2 Hrs (Non-OB) | Enzymatic Hexokinase Method |
| YGTG | Glucose Tolerance 3 Hrs (Gestational) | Enzymatic Hexokinase Method |
| YGT3 | Glucose Tolerance 3 Hrs (Non-OB) | Enzymatic Hexokinase Method |
| YGTG4hour | Glucose Tolerance 4 Hrs (Gestational) | Enzymatic Hexokinase Method |
| YGT4 | Glucose Tolerance 4 Hrs (Non-OB) | Enzymatic Hexokinase Method |
| YGT5 | Glucose Tolerance 5 Hrs (Non-OB) | Enzymatic Hexokinase Method |
| YUGL | Glucose Urine, Random | — |
| YG6PR | Glucose-6-Phosphate Dehydrogenase (G6PD) | Quantitative Enzymatic Assay |
| YBGLU | Glucose, Body Fluid | Enzymatic Hexokinase Method |
| YCGLU | Glucose, CSF | — |
| YUGLUB | Glucose, Urine, 24 Hr. | — |
| YGAD | Glutamic Acid Decarboxylase (GAD) Antibody | Semi-quantitative Enzyme-Linked Immunosorbent Assay |
| YGD65S | Glutamic Acid Decarboxylase (GAD65) Antibody Assay, Serum | — |
| YGLUTT | Glutathione, Total | — |
| YGLUTEN | Gluten IgE | — |
| YGLYCA | GlycA | Nuclear Magnetic Resonance (NMR) |
| YGLCM | GlycoMark (1,5 Anhydroglucitol) Quant, Serum or Plasma | — |
| YFGNDR | Gonadotropin Releasing Hormone | — |
| YGRAMR | Gram Stain | — |
| YGS | Gram Stain | Standard reference procedure for Gram Stain/Microscopic Exam. |
| YGRAPE | Grape IgE | — |
| YGRPFRT | Grapefruit IgE | — |
| YGRNBN | Green Bean (String) IgE | — |
| YGBSP | Group B Strep Screen by RT-PCR | Reverse Transcription Polymerase Chain Reaction |
| YGDF15 | Growth Differentiation Factor 15, Plasma | — |
| YGHRIA | Growth Hormone, RIA | Double Antibody Radioimmunoassay (RIA) |
