Beside other deficiencies, since all nutrients work together, yes.
How Much is Too Much? : Appendix B: Vitamin and Mineral Deficiencies in the U.S.
Nutrient from food alone, ranked by the occurrence of dietary inadequacy among adults | Percentage of dietary intakes below the estimated average requirement for a specific population* | Naturally occurring sources of nutrient**
2-to-8-year-old children | 14-to-18-year-old girls | Adults 19 and older
Vitamin D | 81% | 98% | 95% | Fatty fish, mushrooms [vitamin D is naturally formed in the body when skin is exposed to sunlight; vitamin D is added to fortified milk]
Vitamin E | 65% | 99% | 94% | Nuts, seeds, vegetable oils, green leafy vegetables
Magnesium | 2% | 90% | 61% | Whole grains, wheat bran and wheat germ, green leafy vegetables, legumes, nuts, seeds
Vitamin A | 6% | 57% | 51% | Preformed vitamin A: liver, fatty fish, milk, eggs; provitamin A carotenoids: carrots, pumpkins, tomatoes, leafy green vegetables
Calcium | 23% | 81% | 49% | Milk, yogurt, cheese, kale, broccoli
Vitamin C | 2% | 45% | 43% | All fruits and vegetables, particularly citrus fruits and tomatoes
Vitamin B6 | 0.1% | 18% | 15% | Many foods; highest levels in fish, beef, poultry, potatoes and other starchy vegetables, and fruit other than citrus
Folate | 0.2% | 19% | 13% | Many foods; highest levels in spinach, liver, asparagus, Brussels sprouts [mandatory, standardized addition to enriched flour and flour products]
Zinc | 0.2% | 24% | 12% | Red meat, poultry, beans, nuts, some seafood, whole grains
Iron | 0.7% | 12% | 8% | Highest amounts in meat and seafood; lower levels in nuts and beans [mandatory, standardized addition to enriched flour and flour products]
Thiamin | 0.1% | 10% | 7% | Whole grain products [mandatory, standardized addition to enriched flour and flour products]
Copper | 0% | 16% | 5% | Shellfish, whole grains, beans, nuts, potatoes, organ meats (kidneys, liver)
Vitamin B12 | 0% | 7% | 4% | Animal products: fish, meat, poultry, eggs, milk
Riboflavin | 0% | 5% | 2% | Milk and dairy products, eggs, meat, green leafy vegetables, legumes [mandatory, standardized addition to enriched flour and flour products]
Niacin | 0.1% | 4% | 2% | Meat, fish, seeds and nuts, whole grains [mandatory, standardized addition to enriched flour and flour products]
Selenium | 0% | 2% | 1% | Found in different plant and animal foods; highest levels in seafood and organ meats (kidneys, liver)
To know for sure an RBC magnesium test would tell. Second best probably an whole blood test. Serum is tightly regulated and usually don't show deficiency unless unreal severe.